http://germanshepherds.com/articles/wardogdocumentary/
The year is 1969, and America is at war in Vietnam. Near Danang, a soldier and his "war dog," a German Shepherd named Bruiser, silently creep forward searching for any sign that the enemy is near. Bruiser suddenly stops dead in his tracks, his nose up and ears twitching — signaling that the enemy was near. His handler makes the pivotal decision to fire and seconds later, enemy bullets and grenades rain violently down on the soldiers.
Bruiser’s handler, John Flannelly, is gravely wounded — most of his left side now a gaping wound. Ignoring John's order to leave him on the battlefield, Bruiser drags John to safety while taking two rounds in the process. Other brave soldiers die that day, yet with Bruisers advance warning, many survive including John, who was later reunited with Bruiser in a field hospital.
Reflecting on the profound bond that existed between he and Bruiser during the war, John Flannel said, "Bruiser saved not only my life, but the lives of the other Marines I was working with. I never would have made it without him. I will never be able to thank him enough. I owe my life to that dog."
Bruiser was among more than 4,000 dogs recruited to serve and protect U.S. troops in Vietnam, preventing 10,000-plus American casualties in the process. Yet, only a few of these dogs returned to America at the close of the war. Since these canine heroes were classified by the military as equipment, they were declared "surplus armaments" and either unceremoniously euthanised or left to unknown fates in Vietnam